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Regulatory Development and Retrospective Review Tracker

Reconsideration of Certain New Source Issues: Mercury and Air Toxics Standard (MATS)

a.k.a. Mercury and Air Toxics Standard (MATS) - New Source MACT Reconsideration

RIN: 2060-AR62 (What's this?)

Docket No.: Not yet available (What's this?)

Current Phase: Proposal (What's this?)

EPA has reviewed new technical information associated with certain new-source limits for toxics emitted from new power plants under the Mercury and Air Toxics Standards (MATS). For example, the new information was incorporated into proposed new source standards for mercury from certain coal-fired power plants because the agency recognized that there may be technical challenges associated with monitoring mercury emissions at the levels set for new power plants. Notwithstanding the proposed changes to the mercury and certain other new source air toxics limits, new plants will continue to rely on the same proven pollution control technologies to reduce harmful mercury, acid gases and particle pollution, which will provide important health benefits to the American public. The agency believes this new information warranted further review and followed an expedited, open and transparent process that included public comment on the proposed changes. Revisions to the new source limits were proposed on November 30, 2012, and were published in April 2013.


Notice: Published in FR08/02/2012
NPRM: Sent to OMB for Regulatory Review11/07/2012
NPRM: Received by OMB11/07/2012
NPRM: Regulatory Review Concluded11/16/2012
NPRM: Published in FR11/30/2012
NPRM: Comment Period Open11/30/2012
NPRM: Comment Period Closed12/31/2012
Final Rule: Sent to OMB for Regulatory Review03/05/2013
Final Rule: Received by OMB03/05/2013
Final Rule: Regulatory Review Concluded03/28/2013
Final Rule: Published in FR04/24/2013

Potential Effects

Local Governments
Likely to be regulated by this rule.

State Governments
Likely to be involved in the implementation of this rule.

Tribal Governments
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Participate / Learn More Regulatory Review

Some of EPA's rulemakings undergo regulatory review (What's this?), as prescribed by Executive Order 12866 and coordinated by the Office of Management and Budget (OMB). The following list describes which of this rulemaking's stages have completed review and published in the Federal Register, if any, and provides links to the review documents where available. Consult the "Timeline" section of this Web page for the dates of each review.

  • NPRM - This stage of the rulemaking underwent review.
  • Final Rule - This stage of the rulemaking underwent review.
Citations & Authorities

Federal Register Citations

Code of Federal Regulations (CFR) Citation
40 CFR 60 40 CFR 63

Legal Authority
Clean Air Act Section 111 Clean Air Act Section 112


This site provides summaries of priority rulemakings and priority retrospective reviews of existing regulations. We update most of the site at the beginning of each month, though some data is updated more frequently if it is time sensitive. The information on this site is not intended to and does not commit EPA to specific conclusions or actions. For example, after further analysis, EPA may decide the effects of a rule would be different or it may decide to terminate a rulemaking.

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